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Ansoft Designer / Ansys Designer 在线帮助文档：

Nexxim Simulator >
Nexxim DC Analysis >
   DC Analysis Technical Notes >
       Nexxim DC Analysis Convergence Criteria >
           Limiting Step               


Limiting Step

Nexxim automatically identifies circuits that contain nonlinear elements. For large circuits with many nonlinear devices such as BJTs and MOSFETs, it is necessary to reduce the magnitude of the Δvk update to aid in obtaining convergence. The DC solver limits the size of voltage updates to a maximum value given by the limiting_step option. The default limiting_step for circuits with nonlinear devices is 0.3 Volts.

For circuits that contain only linear devices, Nexxim sets the default for limiting_step to a large number, effectively disabling it. A large limiting_step speeds the convergence of circuits that are mostly linear, while a smaller value may help nonlinear circuits to converge more reliably.



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